Effect of timing of a calcium salt supplement containing palmitic and oleic acids on production responses of early lactation dairy cows

A. Pineda, J. de Souza, JR Newbold, R.M. Kirkland, A.L. Lock

Research output: Contribution to conferencePaper

Abstract

Fifty-six multiparous cows were used in a randomized complete block design experiment and assigned to either a control diet containing no supplemental fat (CON) or a diet supplemented with calcium salts (CS) of palmitic (C16:0) and oleic (C18:1) acids (FAT) either from calving to 24 DIM (fresh period, FR) or from 25 to 67 DIM (peak period, PK). Fresh diets contained (% DM) 17% CP, 23% forage NDF, and 25% starch. Peak diets contained (% DM) 17% CP, 19% forage NDF, and 28% starch. The CS contained 60% C16:0 and 30% C18:1 (total fatty acid basis) and was added at 1.90% of diet DM replacing soyhulls in CON diets. The statistical model included the random effect of block and cow within block and treatment, and the fixed effect of treatment, time, and their interactions. Results are presented in the sequence CON vs. FAT. During FR there was no effect of treatment on DMI (21.2 vs. 21.5 kg/d, P = 0.25), milk yield (40.6 vs. 39.1 kg/d, P = 0.30), or BW change (−2.59 vs. −2.20 kg/d, P = 0.35). Compared with CON, FAT increased milk fat content (4.62 vs. 4.95%, P = 0.02) and yield (1.80 vs. 1.96 kg/d, P = 0.02) and ECM (45.6 vs. 48.4 kg/d, P = 0.05). During PK there was no effect of treatment on DMI (28.1 vs. 28.3 kg/d, P = 0.73), or BW change (0.39 vs. 0.30 kg/d, P = 0.38). Compared with CON, FAT increased milk yield (51.5 vs. 54.0 kg/d, P = 0.05), milk fat content (3.52% vs. 3.63, P = 0.05) and yield (1.82 vs. 2.02 kg/d, P < 0.01) and ECM (51.5 vs. 55.2 kg/d, P < 0.01). A treatment by time interaction was observed for DMI during PK (P = 0.05) because intake was higher for FAT compared with CON after wk 5 of calving. We observed that cows that received FAT compared with CON during FR increased milk yield by 2.7 kg/d (P = 0.04) and ECM by 2.9 kg/d (P = 0.03) during PK indicating a positive carryover effect of CS supplementation early postpartum. Our results demonstrate that feeding a CS supplement containing 60% C16:0 and 30% C18:1 during early lactation increases milk fat yield and ECM without changes in DMI or BW during the fresh and peak periods.
Original languageEnglish
Pages69
Number of pages1
Publication statusFirst published - 23 Jun 2020
EventAmerican Dairy Science Association annual meeting - Online
Duration: 21 Jun 202024 Jun 2020
https://www.adsa.org/Meetings/2020-Annual-Meeting

Conference

ConferenceAmerican Dairy Science Association annual meeting
Abbreviated titleADSA2020
Period21/06/2024/06/20
Internet address

Fingerprint Dive into the research topics of 'Effect of timing of a calcium salt supplement containing palmitic and oleic acids on production responses of early lactation dairy cows'. Together they form a unique fingerprint.

  • Cite this